Apparatus for controlling the compensation of roll eccentricity on a rolling stand

摘要

An arrangement for compensating roll eccentricities distinguishes between back-up rolls with a small difference in diameter (Fig. 1) and those with a large difference in diameter (Fig. 2). In the case of rolls with a small difference in diameter (Fig. 1), only the force (FC, FD) on the two bearing ends (A, B) of the upper back-up roll (1) is recorded and fed together with the angle ( alpha o) of rotation of this back-up roll (1) to separate compensators (3, 4) for frequency analysis. Hydraulic devices (C, D) for adjusting the back-up roll (1) are controlled by way of summing points (5, 6) and position controllers (7, 8). In the case of back-up rolls with a large difference in diameter (Fig. 2), four compensators (9, 10, 11, 12) are controlled in such a way that the ends (A and B) of the upper (1) and lower (2) back-up rolls are supplied with angles ( alpha o, alpha u), with the result that the bearing ends (A) and the bearing ends (B) of the two back-up rolls are in each case processed separately in summing elements (13, 14) arranged on the output side. In summing points (15, 16), desired values are fed in and control of the hydraulic devices (C, D) is performed in position controllers (17, 18) arranged on the output side. <IMAGE>